Measurement and Testing

  • Testing Pressure Safety Valves just got a lot easier

Testing Pressure Safety Valves just got a lot easier

Nov 20 2019 Read 332 Times

In the past it was difficult to test Pressure Safety Valves (PSVs) because a digital gauge, a steam or gas source and a clipboard were needed. After the test was done all the data was recorded, passing valves were measured and all data was recorded by hand. This information was then transcribed into a computer for use in generating a certificate. Not any more.

Now with the Ralston Instruments PSV Test suite of software and hardware it is possible to conduct the test and record most of the information on the calibrator. After the test is completed the data is then transfered electronically to a PC where a certificate with graphs, customer data, tag data and other required information can be created.

The unique PSV test mode captures the PSV crack and reseat pressure by logging pressure at 128 times per second. Most competitors' devices do not reliably capture the crack and reseat because the logging rate is too slow. The PSV mode also allows the user to select from standards such as ASME Boiler Code Section 8, simple crack tests or conditional crack tests where the allowable error may depend on the pressure of the PSV. the user can enter the pressure of the valve at the time of test and type in any other important information right on the FieldLab. Thus when the user returns to the office they can download all important information and create the certificates without a lot of extra effort.

The PSV test mode works with steam and gas valves as well as liquid valves where the user needs to witness the first steady stream of liquid prior to recording the crack pressure. It also has the option of running a leak test and logging the change in pressure and whether any leakage was observed. This provides a great deal of flexibility and allows for a smoother and more reliable workflow in conducting PSV tests. The FieldLab is available from 200 kPa to 70 MPa so it covers the ranges of most PSVs in the field. It is also rated IECEx rated Ex ia IIC T4 Ga (-10 < Ta < 50 °C)so that it can be used in most hazardous locations without a problem.

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